Missouri would come in as a slave state above the 36-30 line, slaves would expand agriculture instead of manufacturing, allowing Missouri to be a slave state would be seen as a victory for the states rights, and the compromise would allow slavery to expand.

Southern Slave States: Why did they support it?

Missouri got to decide if it had slaves, so the states are gaining more power!

Only the federal government had the power to decide whether or not a state would have slaves.

Southern Slave States: Beliefs about states' rights?

Since we are the ones living in the state, we should decide if we have slaves or not!

They thought that the legislative recognition of slavery was a bad precedent, it let slavery expand which made it seem acceptable, and they also thought it increased the power of slave states instead of the federal government.

Southern Slave States: Fears about the Compromise?

If slavery is abolished, the federal government will gain all of the power.

The compromise allowed a slave state in the North, it said which territories were to be free or not, there was an equal number of slave states as free states, and it let Missouri choose to be a slave state (state's power.)

Only state governments could choose they would have slaves or not.

The support for the abolition of slavery was growing and when the northerners abolish slavery, the state governments will lose their power. This would make the government too powerful.